Using the daily precipitation data of 2 510 meteorological stations in China from 1961 to 2019 and the precipitation simulation data of 12 coupling models of CMIP6 from 2030 to 2100 under the SSP2-4.5 future scenario， the values of three annual rainstorm elements （annual rainstorm days， annual rainstorm rainfall， and annual rainstorm intensity） in the historical and future scenarios were calculated based on the kernel density function under four return periods （5，10，20，50 years）. Based on this， the future hazard change of rainstorms in China was assessed. The main conclusions are as follows： \mathrm{①} From a national perspective， the number of rainstorm days and rainfall amount are estimated to increase in the future， and the annual rainstorm intensity is estimated to change differently in different return periods. Under the four return periods， the mean change of annual rainstorm days in China is expected to be 0.36， 0.57， 0.73 and 0.92 days； the mean change of annual rainstorm rainfall is expected to be 22.30， 36.24， 46.92 and 60.12 mm； and the mean change of annual rainstorm intensity is expected to be 2.43， 0.27， -1.95 and -4.86 mm/d. \mathrm{②} From the perspective of different climatic zones， the annual rainstorm rainfall and rainstorm days showed an increasing trend in the Qinghai-Tibet Plateau， Eastern arid zone， Northeast China， North China， and Southwest China， and a decreasing trend in the western arid （semi-arid） zone， Central China， and South China. The annual rainstorm intensity is expected to increase in the Qinghai-Tibet Plateau and decrease in most other regions under the four return periods. \mathrm{③} The hot spot analysis shows that the southeastern and southern Qinghai-Tibet Plateau are expected to be the areas with the most significant increases in rainstorm hazards. The areas with reduced annual rainstorm days and annual rainstorm rainfall are expected to be concentrated in the middle of Southwest China， the middle and south of Central China and South China. Finally， the areas with reduced annual rainstorm intensities are expected to be concentrated in the middle of the eastern arid zone， the west of Southwest China， and the north and south of North China.